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KVM: s390: ucontrol: export SIE control block to user

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This patch exports the s390 SIE hardware control block to userspace
via the mapping of the vcpu file descriptor. In order to do so,
a new arch callback named kvm_arch_vcpu_fault  is introduced for all
architectures. It allows to map architecture specific pages.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Carsten Otte
2012-01-04 10:25:23 +01:00
committed by Avi Kivity
parent e168bf8de3
commit 5b1c1493af
8 changed files with 37 additions and 1 deletions
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5
Documentation/virtual/kvm/api.txt
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@@ -218,6 +218,11 @@ allocation of vcpu ids. For example, if userspace wants
single-threaded guest vcpus, it should make all vcpu ids be a multiple
of the number of vcpus per vcore.
For virtual cpus that have been created with S390 user controlled virtual
machines, the resulting vcpu fd can be memory mapped at page offset
KVM_S390_SIE_PAGE_OFFSET in order to obtain a memory map of the virtual
cpu's hardware control block.
4.8 KVM_GET_DIRTY_LOG (vm ioctl)
Capability: basic